Siemens SINUMERIK 840D sl Operating Manual page 22

Introduction
1.3 Machine control panels
(8)
(9)
(10)
22
Direction keys
Select the traversing direction.
...
RAPID
Traverse axis in rapid traverse while pressing the direction key.
WCS MCS
Switches between the workpiece coordinate system (WCS = work) and
machine coordinate system (MCS = machine).
Spindle control with override switch
SPINDLE STOP
Stop spindle.
SPINDLE START
Spindle is enabled.
Feed control with override switch
FEED STOP
Stops execution of the running program and shuts down axis drives.
FEED START
Enable for program execution in the current block and enable for ramp-up
to the feedrate value specified by the program.
Keyswitch (four positions)
Operating Manual, 01/2008, 6FC5398-7AP10-0BA0
HMI sl Turning